Enchance deployability: Dockerfile, PyPI/`devpi` releases, `requirements.txt`, etc.

[Nubly]

Currently manually installing through pip after cloning isn't the best way of deploying things. We should add some simple improvements to make the server and clients easier to deploy.

Some things to consider/add:

• Dockerfile
  • Publish to upstream container registry
• requirements.txt
• Upstream PyPI/devpi package releases to be able to install without needing the repo cloned
  • Should use twine for this
  • Consider separate CLI/server packages?
  • Fixup setup.py to include numpy